Jin Park | f7eb6c5 | 2011-07-04 17:43:42 +0900 | [diff] [blame] | 1 | /* |
| 2 | * linux/drivers/regulator/aat2870-regulator.c |
| 3 | * |
| 4 | * Copyright (c) 2011, NVIDIA Corporation. |
| 5 | * Author: Jin Park <jinyoungp@nvidia.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * version 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 19 | * 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/err.h> |
Randy Dunlap | 3a7d021 | 2011-07-30 06:13:09 +0200 | [diff] [blame] | 25 | #include <linux/module.h> |
Jin Park | f7eb6c5 | 2011-07-04 17:43:42 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/regulator/driver.h> |
| 30 | #include <linux/regulator/machine.h> |
| 31 | #include <linux/mfd/aat2870.h> |
| 32 | |
| 33 | struct aat2870_regulator { |
| 34 | struct platform_device *pdev; |
| 35 | struct regulator_desc desc; |
| 36 | |
| 37 | const int *voltages; /* uV */ |
| 38 | |
| 39 | int min_uV; |
| 40 | int max_uV; |
| 41 | |
| 42 | u8 enable_addr; |
| 43 | u8 enable_shift; |
| 44 | u8 enable_mask; |
| 45 | |
| 46 | u8 voltage_addr; |
| 47 | u8 voltage_shift; |
| 48 | u8 voltage_mask; |
| 49 | }; |
| 50 | |
| 51 | static int aat2870_ldo_list_voltage(struct regulator_dev *rdev, |
| 52 | unsigned selector) |
| 53 | { |
| 54 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 55 | |
| 56 | return ri->voltages[selector]; |
| 57 | } |
| 58 | |
| 59 | static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev, |
| 60 | unsigned selector) |
| 61 | { |
| 62 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 63 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); |
| 64 | |
| 65 | return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask, |
Axel Lin | a5228d2 | 2011-11-28 14:07:48 +0800 | [diff] [blame] | 66 | selector << ri->voltage_shift); |
Jin Park | f7eb6c5 | 2011-07-04 17:43:42 +0900 | [diff] [blame] | 67 | } |
| 68 | |
| 69 | static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev) |
| 70 | { |
| 71 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 72 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); |
| 73 | u8 val; |
| 74 | int ret; |
| 75 | |
| 76 | ret = aat2870->read(aat2870, ri->voltage_addr, &val); |
| 77 | if (ret) |
| 78 | return ret; |
| 79 | |
| 80 | return (val & ri->voltage_mask) >> ri->voltage_shift; |
| 81 | } |
| 82 | |
| 83 | static int aat2870_ldo_enable(struct regulator_dev *rdev) |
| 84 | { |
| 85 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 86 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); |
| 87 | |
| 88 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, |
| 89 | ri->enable_mask); |
| 90 | } |
| 91 | |
| 92 | static int aat2870_ldo_disable(struct regulator_dev *rdev) |
| 93 | { |
| 94 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 95 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); |
| 96 | |
| 97 | return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0); |
| 98 | } |
| 99 | |
| 100 | static int aat2870_ldo_is_enabled(struct regulator_dev *rdev) |
| 101 | { |
| 102 | struct aat2870_regulator *ri = rdev_get_drvdata(rdev); |
| 103 | struct aat2870_data *aat2870 = dev_get_drvdata(ri->pdev->dev.parent); |
| 104 | u8 val; |
| 105 | int ret; |
| 106 | |
| 107 | ret = aat2870->read(aat2870, ri->enable_addr, &val); |
| 108 | if (ret) |
| 109 | return ret; |
| 110 | |
| 111 | return val & ri->enable_mask ? 1 : 0; |
| 112 | } |
| 113 | |
| 114 | static struct regulator_ops aat2870_ldo_ops = { |
| 115 | .list_voltage = aat2870_ldo_list_voltage, |
| 116 | .set_voltage_sel = aat2870_ldo_set_voltage_sel, |
| 117 | .get_voltage_sel = aat2870_ldo_get_voltage_sel, |
| 118 | .enable = aat2870_ldo_enable, |
| 119 | .disable = aat2870_ldo_disable, |
| 120 | .is_enabled = aat2870_ldo_is_enabled, |
| 121 | }; |
| 122 | |
| 123 | static const int aat2870_ldo_voltages[] = { |
| 124 | 1200000, 1300000, 1500000, 1600000, |
| 125 | 1800000, 2000000, 2200000, 2500000, |
| 126 | 2600000, 2700000, 2800000, 2900000, |
| 127 | 3000000, 3100000, 3200000, 3300000, |
| 128 | }; |
| 129 | |
| 130 | #define AAT2870_LDO(ids) \ |
| 131 | { \ |
| 132 | .desc = { \ |
| 133 | .name = #ids, \ |
| 134 | .id = AAT2870_ID_##ids, \ |
| 135 | .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \ |
| 136 | .ops = &aat2870_ldo_ops, \ |
| 137 | .type = REGULATOR_VOLTAGE, \ |
| 138 | .owner = THIS_MODULE, \ |
| 139 | }, \ |
| 140 | .voltages = aat2870_ldo_voltages, \ |
| 141 | .min_uV = 1200000, \ |
| 142 | .max_uV = 3300000, \ |
| 143 | } |
| 144 | |
| 145 | static struct aat2870_regulator aat2870_regulators[] = { |
| 146 | AAT2870_LDO(LDOA), |
| 147 | AAT2870_LDO(LDOB), |
| 148 | AAT2870_LDO(LDOC), |
| 149 | AAT2870_LDO(LDOD), |
| 150 | }; |
| 151 | |
| 152 | static struct aat2870_regulator *aat2870_get_regulator(int id) |
| 153 | { |
| 154 | struct aat2870_regulator *ri = NULL; |
| 155 | int i; |
| 156 | |
| 157 | for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) { |
| 158 | ri = &aat2870_regulators[i]; |
| 159 | if (ri->desc.id == id) |
| 160 | break; |
| 161 | } |
| 162 | |
Axel Lin | d4d6373 | 2011-11-28 14:06:31 +0800 | [diff] [blame] | 163 | if (i == ARRAY_SIZE(aat2870_regulators)) |
Jin Park | f7eb6c5 | 2011-07-04 17:43:42 +0900 | [diff] [blame] | 164 | return NULL; |
| 165 | |
| 166 | ri->enable_addr = AAT2870_LDO_EN; |
| 167 | ri->enable_shift = id - AAT2870_ID_LDOA; |
| 168 | ri->enable_mask = 0x1 << ri->enable_shift; |
| 169 | |
| 170 | ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ? |
| 171 | AAT2870_LDO_CD : AAT2870_LDO_AB; |
| 172 | ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4; |
| 173 | ri->voltage_mask = 0xF << ri->voltage_shift; |
| 174 | |
| 175 | return ri; |
| 176 | } |
| 177 | |
| 178 | static int aat2870_regulator_probe(struct platform_device *pdev) |
| 179 | { |
| 180 | struct aat2870_regulator *ri; |
| 181 | struct regulator_dev *rdev; |
| 182 | |
| 183 | ri = aat2870_get_regulator(pdev->id); |
| 184 | if (!ri) { |
| 185 | dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id); |
| 186 | return -EINVAL; |
| 187 | } |
| 188 | ri->pdev = pdev; |
| 189 | |
| 190 | rdev = regulator_register(&ri->desc, &pdev->dev, |
Rajendra Nayak | 2c043bc | 2011-11-18 16:47:19 +0530 | [diff] [blame] | 191 | pdev->dev.platform_data, ri, NULL); |
Jin Park | f7eb6c5 | 2011-07-04 17:43:42 +0900 | [diff] [blame] | 192 | if (IS_ERR(rdev)) { |
| 193 | dev_err(&pdev->dev, "Failed to register regulator %s\n", |
| 194 | ri->desc.name); |
| 195 | return PTR_ERR(rdev); |
| 196 | } |
| 197 | platform_set_drvdata(pdev, rdev); |
| 198 | |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static int __devexit aat2870_regulator_remove(struct platform_device *pdev) |
| 203 | { |
| 204 | struct regulator_dev *rdev = platform_get_drvdata(pdev); |
| 205 | |
| 206 | regulator_unregister(rdev); |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static struct platform_driver aat2870_regulator_driver = { |
| 211 | .driver = { |
| 212 | .name = "aat2870-regulator", |
| 213 | .owner = THIS_MODULE, |
| 214 | }, |
| 215 | .probe = aat2870_regulator_probe, |
| 216 | .remove = __devexit_p(aat2870_regulator_remove), |
| 217 | }; |
| 218 | |
| 219 | static int __init aat2870_regulator_init(void) |
| 220 | { |
| 221 | return platform_driver_register(&aat2870_regulator_driver); |
| 222 | } |
| 223 | subsys_initcall(aat2870_regulator_init); |
| 224 | |
| 225 | static void __exit aat2870_regulator_exit(void) |
| 226 | { |
| 227 | platform_driver_unregister(&aat2870_regulator_driver); |
| 228 | } |
| 229 | module_exit(aat2870_regulator_exit); |
| 230 | |
| 231 | MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator"); |
| 232 | MODULE_LICENSE("GPL"); |
| 233 | MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>"); |